X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fstrxfrm.c;h=c17d867f6381c4dc235d4670047fbf38eeaf8977;hb=d446b1531b82def47b9b684517a7c629c7400aab;hp=5b0fabb3fa75ffe354a3cb516d8c7e936cdfc50d;hpb=b06bbb1e2a100095da21e18139e4f960604d0d02;p=pdclib

diff --git a/functions/string/strxfrm.c b/functions/string/strxfrm.c
index 5b0fabb..c17d867 100644
--- a/functions/string/strxfrm.c
+++ b/functions/string/strxfrm.c
@@ -1,23 +1,49 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* strxfrm( char *, const char *, size_t )
 
-#include <__size_t.h>
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
 
-// TODO: Dummy function, no locale support yet.
+#include <string.h>
 
-size_t strlen( const char * src );
-char * strncpy( char * restrict dest, const char * restrict src, size_t n );
+#ifndef REGTEST
 
-size_t strxfrm( char * restrict dest, const char * restrict src, size_t n )
+#include <locale.h>
+
+size_t strxfrm( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n )
 {
-    size_t len = strlen( src );
+    const _PDCLIB_ctype_t * ctype = _PDCLIB_lconv.ctype;
+    size_t len = strlen( s2 );
     if ( len < n )
     {
-        strncpy( dest, src, len );
+        /* Cannot use strncpy() here as the filling of s1 with '\0' is not part
+           of the spec.
+        */
+        while ( n-- && ( *s1++ = ctype[(unsigned char)*s2++].collation ) );
     }
     return len;
 }
+
+#endif
+
+#ifdef TEST
+
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+    char s[] = "xxxxxxxxxxx";
+    TESTCASE( strxfrm( NULL, "123456789012", 0 ) == 12 );
+    TESTCASE( strxfrm( s, "123456789012", 12 ) == 12 );
+    /*
+    The following test case is true in *this* implementation, but doesn't have to.
+    TESTCASE( s[0] == 'x' );
+    */
+    TESTCASE( strxfrm( s, "1234567890", 11 ) == 10 );
+    TESTCASE( s[0] == '1' );
+    TESTCASE( s[9] == '0' );
+    TESTCASE( s[10] == '\0' );
+    return TEST_RESULTS;
+}
+
+#endif